What if the engineer had a new primary, called the texas two-shot. Fires two shots, 25% magazine increase, 30% max ammo increase, 25% damage penalty.
For sniper, Sydney's finest, melee, 10% damage increase, +25 health, +15% explosive vulnerability.
Heavy, Buisness Runner, Secondary, Shotgun, -25% magazine size, 15% damage increase, + 10% max ammo capacity, - 15 health.